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Figure 1 The polymeric chain of [Ca(sp)2], showing the formation of the cyclic motif (a); A view of [Ca(sp)2] (b) with displacement ellipsoids shown at the 30% probability level. H atoms and C6H5 groups have been omitted for clarity. Symmetry codes: (i) −x, y, −z + ; (ii) x, y + 1, z. |